3月12日 数组

//一维数组【相同数据类型】
//第一种定义方式

// int[] shuzu = new int[5];

shuzu[0]=1;

shuzu[1]=2;

shuzu[2]=3;

shuzu[3]=4;

shuzu[4]=5;

for(int i=1;i<5;i++)

{

shuzu[i]=i+1;

}

//第二种定义方式
//int[] shuzu = new int[] { 1,2,3,4,5 };
//Console.WriteLine(shuzu[2]);

案例：

1. //从控制台输入10个人的年龄放入数组，
   //将十个人的年龄求总和

 

  
            int []shuzu= new int[10];
            int sum = 0;
            for (int i = 0; i < 10; i++)
            {
                Console.Write("请输入第"+(i+1)+"个人年龄：");
                shuzu[i] = int.Parse(Console.ReadLine());
                sum += shuzu[i];
            }
            Console.WriteLine("年龄总和为：" + sum);
            Console.ReadLine();

 

 

 

 2.   //输入人名放进数组，输出第5个人的姓名

 

   Console.Write("请输入有多少人：");
            int a = int.Parse(Console.ReadLine());
            string[] name = new string[a];
            if (a >= 5)
            {
                for (int i = 0; i < a; i++)
                {
                    Console.Write("请输入第" + (i + 1) + "个人的名字：");
                    name[i] = Console.ReadLine();
                }
                Console.WriteLine("第五个人的名字是:"+name[4]);
            }
            else
            {
                Console.WriteLine("您的输入有误！");
            }  
            Console.ReadLine();

 

 

3.    //输入班级人数，根据人数，
      //挨个输入成绩，求平均分

  Console.Write("请输入班级人数：");
            int a = int.Parse(Console.ReadLine());
            double sum = 0;
            double[]chengji=new double[a];
            for (int i = 0; i < a; i++)
            {
                Console.Write("请输入第"+(i+1)+"个人的成绩：");
                chengji[i] = double.Parse(Console.ReadLine());
                sum += chengji[i];

            }
            Console.WriteLine("平均分为："+(sum/a));
            Console.ReadLine();

 

 

二维数组:(两种表达方式)

int[,] shuzu = new int[3, 4]; 有3个一维数组，每个一维数组有4个值。
int[,] shuzu = new int[,]

{
{1,2,3,4},
{5,6,7,8},
{6,7,8,9}
};

 

案例：

1.  用二维数组写“王”。

            string[,] shuzu = new string[,] {
            {"  ","■","■","■","■","■",""},
            {"  ","  ","  ","■","","",""},
            {"  ","  ","  ","■","","",""},
            {"  ","  ","■","■","■","",""},
            {"  ","  ","  ","■","  ","  ",""},
            {"  ","  ","  ","■","  ","  ",""},
            {"■","■","■","■","■","■","■"}
            };

            for (int i = 0; i < 7; i++)
            {
                for (int j = 0; j < 7; j++)
                {
                    Console.Write(shuzu[i, j]);
                }
                Console.WriteLine();
            }
             Console.ReadLine();

 

 

2.  //输入班级人数，将每个人的
     //语文，数学，英语成绩输入二维数组

   Console.Write("请输入班级人数：");
            int a = int.Parse(Console.ReadLine());
            double[,] chengji = new double[a, 3];
            for (int i = 0; i < a; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    if (j == 0)
                    {
                        Console.Write("请输入第"+(i+1)+"个人的语文成绩：");
                    }
                    if (j == 1)
                    {
                        Console.Write("请输入第" + (i + 1) + "个人的数学成绩：");
                    }
                    if (j == 2)
                    {
                        Console.Write("请输入第" + (i + 1) + "个人的英语成绩：");
                    }
                    chengji[i,j]=double.Parse(Console.ReadLine());
                }                
            }          
            Console.ReadLine();

 

3.  //使用二维数组打印“企”。

  string[,] shuzu = new string[8, 7]
            {
                {"   ","  ","  ","■"," "," "," "},
                {"  ","  ","■","  ","■"," "," "},
                {"  ","■","  ","  ","  ","■"," "},
                {"■","  ","  ","■","  ","  ","■"},
                {"  ","  ","  ","■"," "," "," "},
                {"  ","■","  ","■","■","■"," "},
                {"  ","■","  ","■"," "," "," "},
                {"■","■","■","■","■","■","■"}
            };
            for (int i = 0; i < 8; i++)
            {
                for (int j = 0; j < 7; j++)
                {

                    Console.Write(shuzu[i, j]);

                }
                Console.WriteLine();
            }
            Console.ReadLine();

 

三维数组：
int[, ,] shuzu = new int[3, 2, 4];  3个二维数组，每个二维数组有2个一维数组，每个一维数组有4个数值

{ { {1，2，3，4}，{1，2，3，4}  }，{ {1，2，3，4}，{1，2，3，4} }，{  {1，2，3，4}，{1，2，3，4}   }     }